plusLIEs, mkLIE, isEmptyLIE, lieToList, listToLIE,
Inst,
- pprInst, pprInsts, pprInstsInFull, tidyInsts,
+ pprInst, pprInsts, pprInstsInFull, tidyInsts, tidyMoreInsts,
newDictsFromOld, newDicts,
newMethod, newMethodWithGivenTy, newOverloadedLit,
mkHsTyApp, mkHsDictApp, mkHsConApp, zonkId
)
import TcMonad
-import TcEnv ( TcIdSet, tcGetInstEnv, tcLookupSyntaxId )
+import TcEnv ( TcIdSet, tcGetInstEnv, tcLookupId )
import InstEnv ( InstLookupResult(..), lookupInstEnv )
-import TcType ( TcThetaType,
- TcType, TcTauType, TcTyVarSet,
- zonkTcType, zonkTcTypes, zonkTcPredType,
- zonkTcThetaType, tcInstTyVar, tcInstType
+import TcMType ( zonkTcType, zonkTcTypes, zonkTcPredType,
+ zonkTcThetaType, tcInstTyVar, tcInstType,
+ )
+import TcType ( Type,
+ SourceType(..), PredType, ThetaType,
+ tcSplitForAllTys, tcSplitForAllTys,
+ tcSplitMethodTy, tcSplitRhoTy, tcFunArgTy,
+ isIntTy,isFloatTy, isIntegerTy, isDoubleTy,
+ tcIsTyVarTy, mkPredTy, mkTyVarTy, mkTyVarTys,
+ tyVarsOfType, tyVarsOfTypes, tyVarsOfPred, tidyPred,
+ predMentionsIPs, isClassPred, isTyVarClassPred,
+ getClassPredTys, getClassPredTys_maybe, mkPredName,
+ tidyType, tidyTypes, tidyFreeTyVars,
+ tcCmpType, tcCmpTypes, tcCmpPred
)
import CoreFVs ( idFreeTyVars )
import Class ( Class )
import Name ( Name, mkMethodOcc, getOccName )
import NameSet ( NameSet )
import PprType ( pprPred )
-import Type ( Type, PredType(..), ThetaType,
- isTyVarTy, mkPredTy, mkTyVarTy, mkTyVarTys,
- splitForAllTys, splitSigmaTy, funArgTy,
- splitMethodTy, splitRhoTy,
- tyVarsOfType, tyVarsOfTypes, tyVarsOfPred, tidyPred,
- predMentionsIPs, isClassPred, isTyVarClassPred,
- getClassPredTys, getClassPredTys_maybe, mkPredName,
- tidyType, tidyTypes, tidyFreeTyVars
- )
import Subst ( emptyInScopeSet, mkSubst,
- substTy, substTheta, mkTyVarSubst, mkTopTyVarSubst
+ substTy, substTyWith, substTheta, mkTyVarSubst, mkTopTyVarSubst
)
import Literal ( inIntRange )
import VarEnv ( TidyEnv, lookupSubstEnv, SubstResult(..) )
import VarSet ( elemVarSet, emptyVarSet, unionVarSet )
-import TysWiredIn ( isIntTy,
- floatDataCon, isFloatTy,
- doubleDataCon, isDoubleTy,
- isIntegerTy
- )
+import TysWiredIn ( floatDataCon, doubleDataCon )
import PrelNames( fromIntegerName, fromRationalName )
-import Util ( thenCmp, zipWithEqual )
+import Util ( thenCmp, equalLength )
import Bag
import Outputable
\end{code}
zonkLIE lie = mapBagNF_Tc zonkInst lie
pprInsts :: [Inst] -> SDoc
-pprInsts insts = parens (sep (punctuate comma (map pprInst insts)))
+pprInsts insts = parens (sep (punctuate comma (map pprInst insts)))
pprInstsInFull insts
EQ -> True
other -> False
-cmpInst (Dict _ pred1 _) (Dict _ pred2 _) = (pred1 `compare` pred2)
+cmpInst (Dict _ pred1 _) (Dict _ pred2 _) = pred1 `tcCmpPred` pred2
cmpInst (Dict _ _ _) other = LT
cmpInst (Method _ _ _ _ _ _) (Dict _ _ _) = GT
-cmpInst (Method _ id1 tys1 _ _ _) (Method _ id2 tys2 _ _ _) = (id1 `compare` id2) `thenCmp` (tys1 `compare` tys2)
+cmpInst (Method _ id1 tys1 _ _ _) (Method _ id2 tys2 _ _ _) = (id1 `compare` id2) `thenCmp` (tys1 `tcCmpTypes` tys2)
cmpInst (Method _ _ _ _ _ _) other = LT
-cmpInst (LitInst _ lit1 ty1 _) (LitInst _ lit2 ty2 _) = (lit1 `compare` lit2) `thenCmp` (ty1 `compare` ty2)
+cmpInst (LitInst _ lit1 ty1 _) (LitInst _ lit2 ty2 _) = (lit1 `compare` lit2) `thenCmp` (ty1 `tcCmpType` ty2)
cmpInst (LitInst _ _ _ _) other = GT
-- and they can only have HsInt or HsFracs in them.
instMentionsIPs other ip_names = False
isStdClassTyVarDict (Dict _ pred _) = case getClassPredTys_maybe pred of
- Just (clas, [ty]) -> isStandardClass clas && isTyVarTy ty
+ Just (clas, [ty]) -> isStandardClass clas && tcIsTyVarTy ty
other -> False
\end{code}
-> TcThetaType
-> NF_TcM [Inst]
newDictsAtLoc inst_loc@(_,loc,_) theta
- = tcGetUniques (length theta) `thenNF_Tc` \ new_uniqs ->
- returnNF_Tc (zipWithEqual "newDictsAtLoc" mk_dict new_uniqs theta)
+ = tcGetUniques `thenNF_Tc` \ new_uniqs ->
+ returnNF_Tc (zipWith mk_dict new_uniqs theta)
where
mk_dict uniq pred = Dict (mkLocalId (mkPredName uniq loc pred) (mkPredTy pred)) pred inst_loc
newMethod orig id tys
= -- Get the Id type and instantiate it at the specified types
let
- (tyvars, rho) = splitForAllTys (idType id)
- rho_ty = substTy (mkTyVarSubst tyvars tys) rho
- (pred, tau) = splitMethodTy rho_ty
+ (tyvars, rho) = tcSplitForAllTys (idType id)
+ rho_ty = substTyWith tyvars tys rho
+ (pred, tau) = tcSplitMethodTy rho_ty
in
newMethodWithGivenTy orig id tys [pred] tau
-- This actually builds the Inst
= -- Get the Id type and instantiate it at the specified types
let
- (tyvars,rho) = splitForAllTys (idType real_id)
- rho_ty = ASSERT( length tyvars == length tys )
+ (tyvars,rho) = tcSplitForAllTys (idType real_id)
+ rho_ty = ASSERT( equalLength tyvars tys )
substTy (mkTopTyVarSubst tyvars tys) rho
- (theta, tau) = splitRhoTy rho_ty
+ (theta, tau) = tcSplitRhoTy rho_ty
in
newMethodWith inst_loc real_id tys theta tau `thenNF_Tc` \ meth_inst ->
returnNF_Tc (meth_inst, instToId meth_inst)
-> HsOverLit
-> TcType
-> NF_TcM (TcExpr, LIE)
-newOverloadedLit orig (HsIntegral i) ty
- | isIntTy ty && inIntRange i -- Short cut for Int
- = returnNF_Tc (int_lit, emptyLIE)
-
- | isIntegerTy ty -- Short cut for Integer
- = returnNF_Tc (integer_lit, emptyLIE)
+newOverloadedLit orig lit ty
+ | Just expr <- shortCutLit lit ty
+ = returnNF_Tc (expr, emptyLIE)
- where
- int_lit = HsLit (HsInt i)
- integer_lit = HsLit (HsInteger i)
-
-newOverloadedLit orig lit ty -- The general case
+ | otherwise
= tcGetInstLoc orig `thenNF_Tc` \ loc ->
tcGetUnique `thenNF_Tc` \ new_uniq ->
let
lit_id = mkSysLocal SLIT("lit") new_uniq ty
in
returnNF_Tc (HsVar (instToId lit_inst), unitLIE lit_inst)
+
+shortCutLit :: HsOverLit -> TcType -> Maybe TcExpr
+shortCutLit (HsIntegral i fi) ty
+ | isIntTy ty && inIntRange i && fi == fromIntegerName -- Short cut for Int
+ = Just (HsLit (HsInt i))
+ | isIntegerTy ty && fi == fromIntegerName -- Short cut for Integer
+ = Just (HsLit (HsInteger i))
+
+shortCutLit (HsFractional f fr) ty
+ | isFloatTy ty && fr == fromRationalName
+ = Just (mkHsConApp floatDataCon [] [HsLit (HsFloatPrim f)])
+ | isDoubleTy ty && fr == fromRationalName
+ = Just (mkHsConApp doubleDataCon [] [HsLit (HsDoublePrim f)])
+
+shortCutLit lit ty
+ = Nothing
\end{code}
tidyInst env (Dict u pred loc) = Dict u (tidyPred env pred) loc
tidyInst env (Method u id tys theta tau loc) = Method u id (tidyTypes env tys) theta tau loc
-tidyInsts :: [Inst] -> (TidyEnv, [Inst])
+tidyMoreInsts :: TidyEnv -> [Inst] -> (TidyEnv, [Inst])
-- This function doesn't assume that the tyvars are in scope
-- so it works like tidyOpenType, returning a TidyEnv
-tidyInsts insts
- = (env, map (tidyInst env) insts)
+tidyMoreInsts env insts
+ = (env', map (tidyInst env') insts)
where
- env = tidyFreeTyVars emptyTidyEnv (tyVarsOfInsts insts)
+ env' = tidyFreeTyVars env (tyVarsOfInsts insts)
+
+tidyInsts :: [Inst] -> (TidyEnv, [Inst])
+tidyInsts insts = tidyMoreInsts emptyTidyEnv insts
\end{code}
FoundInst tenv dfun_id
-> let
- (tyvars, rho) = splitForAllTys (idType dfun_id)
+ (tyvars, rho) = tcSplitForAllTys (idType dfun_id)
mk_ty_arg tv = case lookupSubstEnv tenv tv of
Just (DoneTy ty) -> returnNF_Tc ty
Nothing -> tcInstTyVar tv `thenNF_Tc` \ tc_tv ->
let
subst = mkTyVarSubst tyvars ty_args
dfun_rho = substTy subst rho
- (theta, _) = splitRhoTy dfun_rho
+ (theta, _) = tcSplitRhoTy dfun_rho
ty_app = mkHsTyApp (HsVar dfun_id) ty_args
in
if null theta then
-- Literals
-lookupInst inst@(LitInst u (HsIntegral i) ty loc)
- | isIntTy ty && in_int_range -- Short cut for Int
- = returnNF_Tc (GenInst [] int_lit)
- -- GenInst, not SimpleInst, because int_lit is actually a constructor application
+-- Look for short cuts first: if the literal is *definitely* a
+-- int, integer, float or a double, generate the real thing here.
+-- This is essential (see nofib/spectral/nucleic).
+-- [Same shortcut as in newOverloadedLit, but we
+-- may have done some unification by now]
- | isIntegerTy ty -- Short cut for Integer
- = returnNF_Tc (GenInst [] integer_lit)
+lookupInst inst@(LitInst u lit ty loc)
+ | Just expr <- shortCutLit lit ty
+ = returnNF_Tc (GenInst [] expr) -- GenInst, not SimpleInst, because
+ -- expr may be a constructor application
- | otherwise -- Alas, it is overloaded and a big literal!
- = tcLookupSyntaxId fromIntegerName `thenNF_Tc` \ from_integer ->
+lookupInst inst@(LitInst u (HsIntegral i from_integer_name) ty loc)
+ = tcLookupId from_integer_name `thenNF_Tc` \ from_integer ->
newMethodAtLoc loc from_integer [ty] `thenNF_Tc` \ (method_inst, method_id) ->
- returnNF_Tc (GenInst [method_inst] (HsApp (HsVar method_id) integer_lit))
- where
- in_int_range = inIntRange i
- integer_lit = HsLit (HsInteger i)
- int_lit = HsLit (HsInt i)
+ returnNF_Tc (GenInst [method_inst]
+ (HsApp (HsVar method_id) (HsLit (HsInteger i))))
--- similar idea for overloaded floating point literals: if the literal is
--- *definitely* a float or a double, generate the real thing here.
--- This is essential (see nofib/spectral/nucleic).
-lookupInst inst@(LitInst u (HsFractional f) ty loc)
- | isFloatTy ty = returnNF_Tc (GenInst [] float_lit)
- | isDoubleTy ty = returnNF_Tc (GenInst [] double_lit)
-
- | otherwise
- = tcLookupSyntaxId fromRationalName `thenNF_Tc` \ from_rational ->
+lookupInst inst@(LitInst u (HsFractional f from_rat_name) ty loc)
+ = tcLookupId from_rat_name `thenNF_Tc` \ from_rational ->
newMethodAtLoc loc from_rational [ty] `thenNF_Tc` \ (method_inst, method_id) ->
let
- rational_ty = funArgTy (idType method_id)
+ rational_ty = tcFunArgTy (idType method_id)
rational_lit = HsLit (HsRat f rational_ty)
in
returnNF_Tc (GenInst [method_inst] (HsApp (HsVar method_id) rational_lit))
-
- where
- floatprim_lit = HsLit (HsFloatPrim f)
- float_lit = mkHsConApp floatDataCon [] [floatprim_lit]
- doubleprim_lit = HsLit (HsDoublePrim f)
- double_lit = mkHsConApp doubleDataCon [] [doubleprim_lit]
\end{code}
There is a second, simpler interface, when you want an instance of a
\begin{code}
lookupSimpleInst :: Class
- -> [Type] -- Look up (c,t)
+ -> [Type] -- Look up (c,t)
-> NF_TcM (Maybe ThetaType) -- Here are the needed (c,t)s
lookupSimpleInst clas tys
FoundInst tenv dfun
-> returnNF_Tc (Just (substTheta (mkSubst emptyInScopeSet tenv) theta))
where
- (_, theta, _) = splitSigmaTy (idType dfun)
+ (_, rho) = tcSplitForAllTys (idType dfun)
+ (theta,_) = tcSplitRhoTy rho
other -> returnNF_Tc Nothing
\end{code}
-
-